Hi, Xuguang
As to my knowledge, there are *at least" two ways in NCL you can use for band-filtering analysis (also appropriate for low-frequencey filter and high-frequncey filter).
1) Fourier harmonics anal: using *ezfftf* and *ezfftb* together, which is most tranditional and simpliest way to extract the signals you need from a time series.
2) Lancos filtering: http://www.ncl.ucar.edu/Document/Functions/Built-in/filwgts_lancos.shtml, which also works well.
Good luck!
Jing
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Jing Yang *
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IPRC-SOEST Unversity of Hawaii *
1680 East West Road, POST Bldg.401 *
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USA *
Ph.(O): 808-956-9462 *
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